One who tends to give too much information while telling a story. Often leads to other stories that have nothing to do with the original topic. The person then, at some point, loops back around to the original story and forgot what he was saying.
When spotted out to lunch with a woman, whom was not his wife, John went into over explainer mode.

John: Oh...hey guys, this is my niece, Mary. I just met her for lunch here because my wife asked me to give her something. Oh I know this place is kind of out of the way but we met here because she'd never been here before and she just graduated and uh, I normally don't go to lunch with other women but...

by heatherindallas October 15, 2007
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Someone that gives you more information than needed to answer your question.
Question: Why is my creative blurry?
Correct response: You need a photo/image/logo with a higher resolution.

Over Explainer: All web advertisements are low resolution in comparison to print to keep the file sizes manageable. If you want to resend the image at high resolution, we can try to resize it larger, but bear in mind, typical web ads are 72 dpi as opposed to 200+ for print. Blurriness is usually caused due to low resolution, and web ads are created at a lower resolution than print ads in order to keep the file size down.
by Citygirl33 February 15, 2022
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